Mine already lost interest some long time ago. Their peak was at the end of Civ3 and beginning of Civ4 era. Neither of the boys even looked at Civ5.

The older one has married over a year ago and is well on the way of getting his PhD degree. He is second year in graduate school. The younger one will be out of college this summer. So, time flies by. Looking at it in retrospect now, these were one of the most enjoyable memories and they both still are quite fond of them as we spent countless hours working out the settler factory strategies and waging wars in hotseat.